Power Vent vs Atmospheric Vent Water Heater — Which Is Right for Vancouver Homes
Published: July 15, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC
What Is the Difference
An atmospheric vent water heater uses natural convection to exhaust combustion gases up through a vertical metal chimney. A power vent water heater uses an electric blower fan to push exhaust gases horizontally through PVC pipe to an outside wall. Atmospheric vent models are simpler, quieter, and cheaper to purchase — typically 500-700 dollars for the unit alone. Power vent models are more efficient (0.64-0.67 UEF vs 0.58-0.62 for atmospheric), can be vented horizontally without a chimney, and are less susceptible to backdrafting. The power vent blower adds approximately 200-400 dollars to the unit cost and uses a small amount of electricity.
Venting Requirements
Atmospheric vent water heaters require a vertical metal chimney or Type B vent that extends above the roofline with proper clearance from windows, doors, and intake vents. If your home does not have an existing chimney or if the chimney is shared with a furnace that has been upgraded to high-efficiency (which uses PVC venting, not the chimney), you cannot install an atmospheric vent water heater. Power vent units can vent horizontally through an exterior wall, making them ideal for homes without chimneys, interior mechanical rooms, or locations where running a chimney is impractical. The vent termination must maintain minimum clearances from windows, doors, and property lines.
Cost Comparison for Vancouver Homes
Installed cost for an atmospheric vent 40-gallon gas water heater: 1,200-1,600 dollars. Installed cost for a power vent 40-gallon gas water heater: 1,800-2,500 dollars. The power vent premium is approximately 600-900 dollars. Annual gas savings from the higher efficiency: approximately 20-40 dollars. The simple payback on the efficiency difference alone is 15-25 years — longer than the unit lifespan. The decision should be based on venting feasibility, not efficiency savings alone. If you have an existing chimney in good condition, atmospheric vent is the cost-effective choice. If you do not have a chimney or it is shared with equipment that has been upgraded, power vent is the practical choice.
Power Direct Vent — A Third Option
A power direct vent water heater is a sealed combustion unit that draws outdoor air for combustion through one pipe and exhausts through another (concentric vent kit). These units are ideal for tight, well-sealed homes where indoor combustion air may be insufficient, or for locations where standard vent termination clearances are difficult to meet. Direct vent units achieve similar efficiency to power vent models (0.65-0.68 UEF) and are sometimes required by code for installations in confined spaces. They cost 200-400 dollars more than standard power vent units due to the specialized vent kit.